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Finding the Third Proportional to 3,121.50 and 3,423

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Solution

The third proportional to 3,121.50 and 3,423 is: 3,753.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.50 : 3,423 = 3,423 : x
  2. Step 2: Convert to fraction form
    3,121.50/3,423 = 3,423/x
  3. Step 3: Cross multiply
    3,121.50x = 3,423 × 3,423
  4. Step 4: Simplify right side
    3,121.50x = 11,716,929
  5. Step 5: Solve for x
    x = 11,716,929/3,121.50
  6. Step 6: Final answer
    x = 3,753.62

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.